Gage-cock.



No. 862,752. PATENTED AUG. 6, 1907.

G. PENNELL.

GAGE COCK.

APPLICATION FILED MAR. 16. 1906.

mi mm IHHHIIIIH 11; 1? ilk L 5mm". fez

6. Pele/z a 5, qwihlcooea GEORGE PENNELL, OF BALTIMORE, MARYLAND;

GAGE-COCK.

Specification of Letters Patent.

Patented Aug. 6, 1907.

Application filed marchle, 1906. Serial No. 306,475.

To all whom it may concern:

. Be it known that I, GEORGE PENNELL, a citizen of the United States, residing at Baltimore, in the county of {Baltimore City and State of Maryland, have invented 1 vice of this class in which the valve seat may be connew and useful Improvements in Gage-Cocks, of which.

the following is a specification.

This invention relates to gage cocks for steam boilers or the like, and has for its objects to produce a comparatively simple, inexpensive device of this character in which the valvewill be maintained in properly seated condition, one wherein the valve is movable relative to its stem, thus to permit ready removal of the valve for renewal, and one wherein liability of the valve becoming fixed in the stem socket is wholly obviated.

A further object of the invention is to provide a deveniently renewed when circumstances require, one wherein the valve will be properly and normally pressed to its seat, thus to insure effective closing of the valve, and one wherein the seating pressure on the valve may be regulated at will.

With these and other objects in view, the invention comprises the novel features of construction and combination of parts more fully hereinafter described.

In the accompanying drawings: Figure l is a central,

longitudinal section through the valve embodying the i invention. Fig 2 is a detail, sectional view taken on the line 2-2 of Fig. 1.

Referring to the drawings, 1 designates a valve casing preferably of the form shown, having a valve chamber 2 v and a tubular extension 3, the central bore 4 of which communicates'with the chamber from which leads to the gage an opening or passage 5, there being extended transversely through the extension 3, which is threaded at its outer end for engagement with the boiler wall, a

' rotary plug valve 6 adapted for closing the passage 4,

the upper end of which is enlarged and internally.

threaded to receive the externally threaded portion or shank 7 of a removable member or piece 8 disposed in the chamber 2 and having a valve seat 9, iwhile provided at the upper end of the enlarged portion of the cess 14 in which is centrally looselyarranged the stem 15 of a substantially semi-spherical valve 16 adapted to close upon the seat 9 and to be maintained in seated position by means of a spring 17 coiled upon the stem 15 within the recess 14, it being noted that the valve 16 which may also close upon the seat 10, as presently explained, will move readily to open position against the action of spring 17 In practice, the valve 16 normally closes upon the seat 9, being held in proper position on the seat by the spring 17, which'will, however, permit the valve to open under the influence of steam pressure through the vpassage '4, it being understood that when the valve is to be fixed in closed position the stem 12 is screwed inward until its inner end bears upon the rear face of the valve head 16, under which conditions the spring will be compressed within the chamber 14. When the stem 12 is unscrewed for releasing and permitting the valve to open the spring 17 in expanding moves the valve relative to the stem and obviates liability of the stem poition 15,becoming rust-bound, or otherwise stuck within the recess, whereby the valve is free at all times for ready disconnection from the stem 12 to permit replacement of the valve, when worn, by a new one.

Should the member or piece 8 be rendered defective owing to wear or other causes, it may be conveniently removed by means of a suitable wrench, and after its removal and pending its replacement the valve may close upon the seat 10.' During the operation of removing the piece 8 which necessitates removal of the plug 11, the

passage 4 may be closed by means of the valve 6 to pre-' vent escape of steam from the boiler.

It may be mentioned that under the construction of gage cocks now in general use it is extremely difficult and in fact practically impossible to detach the valve from its stem in the operation of renewing the valve and this owing to the fact that the stem portions 15 of the valves adhere, through an accumulation of foreign matter therearound within the recess 14, it being apparent that this objection is, under my construction, overcome owing to the provision of the spring 17, which, each time the stem 12 is manipulated for opening the valve, causes relative movement of the latter to maintain the loose connection of the valve and permit its ready disengagement of the stem.

While the device as above described is designed for i use as a gage cook it is apparent that the same may by employing a spring 17 of appropriate strength be advantageously utilized as a safety valve, under which conditions the valve will be maintained in seated position under the action of the spring and will, under abnormal pressure within the boiler, open automatically against the spring action for permitting escape of the steam to such use of the valve the stem 12 may be manipulated for varying the tension on the spring, thus to regulate the boiler pressure necessary for opening thevalve.

relieve high pressure in the boiler, as usual. Under Having thus described my invention, what I claim is:

A device of the class described comprising a valve casing provided with a chamber and having a tubular extension presenting a passage communicating with said chamber, the passage being provided at its inner endwith an internally threaded enlargement, a removable piece comprising a non-circular head disposed in the chamber. and an externally threaded reduced shank screwed into the enlarged and being recessed at the inner end of said opening to'form.

a valve seat, the inner end of the enlarged portion of the passage being formed to provide a second valve seat, a valve stem screwed into the casing in axial alinement with the passage and having at its inner end a central, longitudinal bore, the valve chamber being provided. with a second passage communicating therewith, a valve movably arranged in the chamber and formed to fit on either of said seats for closing communication between the passages,

a stem provided on the valve and extended centrally and loosely into said bore for free movement relative to the first named stem, and n coiled spring arranged in the bore around the stem portion of the valve and to hear at one end on thelatter and at its upper'end on the end wall of the bore, said spring being adapted tohct'upon the valve for causing a relative movement of the stems during opening and closing movement .of the valve.

In testimony whereof/I nfiix my signature in presence of two witnesses.

GEORGE PENNELL.

v Witnesses:

JOHN L. Fnn'rcnnn, H. SCHMIDT. 

